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HttpListener.Start Method

Allows this instance to receive incoming requests.

Namespace:  System.Net
Assembly:  System (in System.dll)

'Declaration
Public Sub Start

ExceptionCondition
HttpListenerException

A Win32 function call failed. Check the exception's ErrorCode property to determine the cause of the exception.

ObjectDisposedException

This object is closed.

This method must be called before you call the GetContext or BeginGetContext method.

After you have started an HttpListener object, you can use the Stop method to stop it.

NoteNote

If this listener instance uses https, you must install and select a Server Certificate. Otherwise, an HttpWebRequest query of this HttpListener will fail with an unexpected close of the connection. You can configure Server Certificates and other listener options by using HttpCfg.exe. See http://msdn.microsoft.com/library/default.asp?url=/library/en-us/http/http/httpcfg_exe.asp for more details.

Notes to Callers

This member outputs trace information when you enable network tracing in your application. For more information, see Network Tracing.

The following code example demonstrates using the Start method to begin processing incoming requests.



Public Shared Sub NonblockingListener(ByVal prefixes() As String)
    Dim listener As New HttpListener()
    For Each s As String In prefixes
        listener.Prefixes.Add(s)
    Next s
    listener.Start()
    Dim result As IAsyncResult = listener.BeginGetContext(New AsyncCallback(AddressOf ListenerCallback), listener)
    ' Applications can do some work here while waiting for the 
    ' request. If no work can be done until you have processed a request,
    ' use a wait handle to prevent this thread from terminating
    ' while the asynchronous operation completes.
    Console.WriteLine("Waiting for request to be processed asyncronously.")
    result.AsyncWaitHandle.WaitOne()
    Console.WriteLine("Request processed asyncronously.")
    listener.Close()
End Sub


.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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